The futex_lock_pi function in kernel/futex.c in the Linux kernel before 2.6.33-rc7 does not properly manage a certain reference count, which allows local users to cause a denial of service (OOPS) via vectors involving an unmount of an ext3 filesystem.
bugzilla.kernel.org/show_bug.cgi?id=14256
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=5ecb01cfdf96c5f465192bdb2a4fd4a61a24c6cc
lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html
secunia.com/advisories/38922
www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.33-rc7
www.mandriva.com/security/advisories?name=MDVSA-2010:088
www.openwall.com/lists/oss-security/2010/02/11/2
www.ubuntu.com/usn/USN-914-1
www.vupen.com/english/advisories/2010/0638